Dumb-waiter machine.



R. M. SYPHER.

DUMB WATER MACHINE.

APPLICATION FILED mAR.3o,1914.

WITNESSES:

MJS-w17!" R. M. SYPHER.

DUMB WAITER MACHINE.

APPLICATION FXLED MAR. SO, 1914y 1,129,434. Patented Feb. 23, 1915.

2 SHEETS-'SHEET 24 WHA/55858.' NVENTOH ROBERT M. SYPHER, OF LEONIA, NEW JERSEY.

DUMB`WAITER MACHINE.

Specication of Letters Patent.

Patented Feb. 23, 1915.

Application led March 30, 1914. Serial No. 828,162.

To all whom 'it may concern Be it known that I, Ronn'r M. SYPHER, a citizen of the United States, residing at Leonia, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in Dumbfvvaiter Machines, of which the following is a specificaticn.

My invention relates to elevating apparatus and particularly to improvements in hand-operating dumbwaiters of the kind known as automatic dumbwaiters. Apparatus of this character has heretofore been provided in which the dunibwaiter is automatically locked in position when the lifting means is released.

The object of my invention is to provide improved automatic locking devices whereby the durnbwaiter may be automatically retained in any desired vertical position in the hatchway.

My invention comprises devices whereby the apparatus is automatically locked either on the upward motion or the downward motion, and regardless of whether the dumb- Waiter car is overbalanced by the counter- Weight or the reverse, whenever the handoperating means, or other means for raising and ylowering the car, is released.

Other ojects of my invention reside in the construction of parts and combinations of elements hereinafter more fully described.

In order that my invention may be more clearly understood, attention is hereby directed to the accompanying drawings form ing part of the specification and illustrating a preferred embodiment of my invention.

Referring to the drawings, Figure 1 represents an end elevation of the entire op erating mechanism, Fig. 2 represents a s ide elevation, and Fig. 3 represents a plan view of the same; Fig. 4 is a part elevation and art sectional view taken on line of Fig. 3 representing the locking device rn free or inoperative position, Fig. 5 is asimilar view representing the locking device in one locking position, the outer casing not being shown in this figure, Fig. 6 1s a sectional view taken on line 6--6 of Fig. 4 and Fig. 7 is a perspective view of the locking lever shown in Figs. 4, 5 and 6.

Referring to the drawings, the rope sheave paratus.

1 is securely fastened to the shaft 2 which may be termed the driving shaft of the ap- The hoisting sheave 3 is loosely mounted upon shaft Q Aand carries the rope 4, one end of which extends to and is fastened. to the dumbwaiter and the other end of which is secured to the counterweight in the well known manner. Rope 4 extends over a small delector sheave 5 mounted on a shaft 6. Endless hand rope 7 runs in the groove of the rope sheave 1. The parts described are supported from a frame 8, on which bearings 9 and 10 for shaft 2 are mounted, shaft 6 being supported as shown from frame 8 by bearings mounted in brackets 11, 1'2. A collar 13 on shaft 2 prevents endwise movement of sheave 3 upon shaft 2. A casing 14 is integral with or secured to the bearing block 1() in which the end of shaft 2 rotates. The automatic locking devices are contained within the casing 14.

Referring to Figs. 4, 5, 6 and 7 of the drawings, a brake or locking band 15 is mounted within the annular surface of oasing 14. This band is resilient and has two adjacent ends having lugs or jaws 16 and 17 formed thereon. A lever 18 is pivotally mounted upon a pin 19 situated between jaws 16 and 17, this lever having a head or enlarged portion 20 situated between the said jaws, the lever also having a lug 21 upon its inwardly extending arm. When the device is in unlocked position, the lever 18 is in the position illustrated in Fig. 4, in which the top and bottom surfaces of the head 2O of lever 18 are parallel to and contacted by the lower and upper surfaces of jaws 16 and 17, respectively, of locking ring 15. the spring ring in this position bearing frictionally upon the inner surface of casing 14 but heilig free to rotate around in the same. Whom however, the lever 18 is partly rotated about pin 19 in a clockwise direction as shown in Fig. 5, the upper and lower corners '2Q and 23 of head 20 of lever 18 press against the lower and upper surfaces, respectively, of jaws 16 and 17 to expand ring 15 into locking engagement with the fixed casing 14. The construction to be described causes the placing of lever 18 in the unlocking position shown in Fig. 4 whenover the dumbwaiter car is being raised or lowered and places the same in the locking position shown in Fig. 5 whenever the raising or lowering actuation of hand rope 7 is discontinued.

An arm 24 is fixedly secured to shaft 2 by a suitable means such as set screw 25. Arm 24 carries upon the under side of its ,end an actuating lug 2G. In Fig. 5, for the sake of simplicity, arm 24 is"omitted, actuating lug 2G thereof alone beingshown. Lever 18, mounted on pin 19, has, as stated, on its inwardly extending arm a lug 21. This lever 18'is also formed With a curved arm 27, eX'- tending partly around shaft 2, and having an upwardly extending 1u g 28 formed at the end thereof, both lugs 21 and 28 lying in the path of lug 26 upon' arm 24. lThe sheave 3 has lugs or projections 29 and 30 formed thereon, as shown in Figs. 4, 5 and 6, and extending into the path of lugs -21 and 28 on lever 18. An arm 31 is loosely mounted on shaft 2 and-carries the pin 19, which is screwed into or otherwise secured to the free end of arm 31, the pin 19 being the pivot for locking lever 18 as previously stated. A torsion springl 32 is mounted upon arm 31, one end of spring 32 engaging a pin or projection 33 on arm 31, Wh1le the other end of the spring engages lug 21 on lever 18, this spring always tending, by its pressure on lug 21, to depress lever 18 into locking position as shown in Fig. 5.

Brake ring 15 is held in place longltudinally of the shaft 2 by a shoulder 34 on casing 14, on the one side of brake band 15 and by an annular projection 35 eXtendmg from sheave 3, on the other side of the brake band.

In describing the operation `of the device, it will be remembered that the dumbwaiter car is automatically locked regardless of whether the car overbalances the counterweight or Whether the counterweight .overbalances the car, when hand rope 7 1s released on either upward or downward Inovement. Assuming first that the unbalanced load on the sheave 3 is in such a direction as to tend to rotate sheave 3 in a counterclockwise direction referring to Figs. 4 and 5, when the hand rope is released the lug 29 on the sheave 3 moves in a counter-clockwise direction and contacting lug 21 on lever 18 oscillates lever 18 in a clockwise direction about pivot pin 19 into the locking position shown in Fig. 5,A the spring 32 aiding this movement. In this position, the corners of head 20 of lever 18 expand ring 15 into a tight engagement with the inner surface of casing 14, so that sheave 3 is locked in that position. The more lug 29 presses on lug 21, the more tightly will band 15 be forced into engagement With casing 14, locking sheave 3 and holdin the dumbwaiter car in position. Still assuming that the load on sheave 3 is in such a direction as to tend to rotate sheave 3 in a counter-clockwise direction referring to Figs. 4 and 5, the action when the car is to be raised is as follows The hand rope Y is actuated in such a direction as to rotate shaft 2 through lug 2G on arm 24 to lug 21 on lever 18 and thence to lug 29 on the sheave 3. Vhen the hand rope 7 is rcleased, the load actuating through lug 2S) on sheave 3, aided by spring again forces lever 18 into locking position. Whenvit desired to lower the load in this case,`the hand rope 7 is actuated in the opposite direi tion giving shaft 2 a counter-cloelmisc rotation. Lug 26 on arni 24 then, contacts pio jection onV the end of arm 2i' of lever 18, lug 28 being so positioned that the contacting of this lug by lu'g 26 oscillates lever 18 about pin 19 in a counter-clockwise direc-- tion, head 20 of the lever 18 again being moved into its unlocking position as shown in Fig. 4. Upon a continuation of this movement of the hand rope, the sheave 3, together with locking ring 15 is rotated in a counter-clockwise direction, the locking lever 18 being held in unlocking position by the camming action of lug 2G on lug 28, and .the sheave 3 rotating in the same coulitenclockwise direction because of the pressure of the load on rope 4 in that direction. Assuming on the other hand that the ell'ective load on rope 4 is in such a direction as to tend to rotate sheave 3 in a clockwise direction, when the hand rope is released the device is locked by lug 30 on sheave 3 contacting lug 28 lon lever 18 and rotating lever 18 about pin 19 in a clockwise direction into the locking position shown in Fig. 5. It is obvious that the effect of lug 30 pressing upon lug 28 in a clockwise direction is the same as that exerted by lug 29 acting on lug 21 in acounter-clockwise direction. lVhen now it is desired to unlock and raise the load, shaft 2 is turned in a counter-clockwise direction by the hand rope, lug 26 on arm 24 contacting lug 28 to e-.un lever 18 into its unlocking position. A continuation of this movement causes the rotation of sheave 3 in a counter-clockwise direction, by the pressure of lug 28 upon lug 30. lVhcn the actuation of the hand rope is stopped, the pressure of lug 30 on lug again locks the device. To lower the load in tliisiease, shaft 2 is turned in a clockwise direction. lug 26 on arm 24 striking lug 21 on lever 18 to swing the lever into unlockingposition, in i by either of said actuating means moves said lever into locking position, substantially as set forth.

12. In apparatus of the character described, the combination with a shaft, a sheave loose thereon having lever-actuating means on either side of said shaft, a locking lever having portions respectively interposed inthe path of said lever-actuating means in either direction of rotation, and a vmember lixed to said shaft having a portion situated between and adapted to contact one or the other of said portions, on rotation of said shaft, to rotate said lever into unlocking position, substantially as set forth.

13, In apparat-ns of the character described, the combination with a shaft, a sheave loose thereon, means for locking said sheavo against rotation, comprising a lever having locking and unlocking positions, means secured to said shea-ve on one side of said lever, adapted, on rotation of said sheave inone direction, to force said lever into locking position, and means Secured to said shaft, on the other side of said lever, adapted, on rotation of said shaft in the opposite direction, to Contact said lever and forcethe same into unlocking position, substantially as set forth.

14. In apparatus of the character described, the combination with a shaft, a sheave loose thereon, means for locking said sheave against rotation, comprising a lever having locking and unlocking positions, means secured to said sheave on one side of said lever, and means securedto said shaft on the other side of said lever, adapted, on rotation of said shaft in one direction, to contact and move said lever into unlocking position and to rotate said sheave through contact of said lever with said means secured to said sheave, substantially as set forth.

l5. In apparatus of the character described, the combination with a shaft, a sheave loose thereon, means for locking said sheavo against rotation, comprising a lever having a locking and an unlocking position, means secured to said shaft adapted, on rotation of said shaft in either direction, to contact said lever and move the same to unu locking position, and means, secured to said sheave, adapted on rotation of said sheave in either direction, when saidshaft is stationary, to contact the lever and move the same to locking position, substantially as set forth.

1G. In apparatus of the character described, the combination with a shaft, a sheare loose thereon, means for locking said sheave against rotation, comprising lever means, h ving locking and unlocking positions, meL ns secured to said shaft, adapted, on rotation of said shaft in either direction, to contact said lever means and move the same to sunlocking position, and means, socured to said sheave, adapted to be contacted by said lever means in unlocking position of the latter, on rotation of said shaft in either direction, to connect said sheave for rotation to said shaft, substantially as set forth.

This specification signed and witnessed this 28th day of March, 1914.

ROBERT M. SYPHER.

Witnesses:

Dafne SMITH, I. MoINTosH. 

